Mercurial > dropbear

annotate libtommath/bn_mp_mul_2.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include <tommath.h>
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2 #ifdef BN_MP_MUL_2_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
389
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
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16 */
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17
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18 /* b = a*2 */
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19 int mp_mul_2(mp_int * a, mp_int * b)
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20 {
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21 int x, res, oldused;
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22
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23 /* grow to accomodate result */
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24 if (b->alloc < a->used + 1) {
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25 if ((res = mp_grow (b, a->used + 1)) != MP_OKAY) {
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26 return res;
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27 }
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28 }
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29
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30 oldused = b->used;
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31 b->used = a->used;
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32
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33 {
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34 register mp_digit r, rr, *tmpa, *tmpb;
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35
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36 /* alias for source */
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37 tmpa = a->dp;
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38
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39 /* alias for dest */
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40 tmpb = b->dp;
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41
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42 /* carry */
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43 r = 0;
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44 for (x = 0; x < a->used; x++) {
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45
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46 /* get what will be the *next* carry bit from the
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47 * MSB of the current digit
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48 */
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49 rr = *tmpa >> ((mp_digit)(DIGIT_BIT - 1));
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50
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51 /* now shift up this digit, add in the carry [from the previous] */
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52 *tmpb++ = ((*tmpa++ << ((mp_digit)1)) | r) & MP_MASK;
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53
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54 /* copy the carry that would be from the source
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55 * digit into the next iteration
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56 */
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57 r = rr;
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58 }
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59
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60 /* new leading digit? */
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61 if (r != 0) {
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62 /* add a MSB which is always 1 at this point */
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63 *tmpb = 1;
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64 ++(b->used);
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65 }
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66
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67 /* now zero any excess digits on the destination
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68 * that we didn't write to
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69 */
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70 tmpb = b->dp + b->used;
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71 for (x = b->used; x < oldused; x++) {
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72 *tmpb++ = 0;
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73 }
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74 }
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75 b->sign = a->sign;
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76 return MP_OKAY;
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77 }
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78 #endif
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79
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80 /* $Source: /cvs/libtom/libtommath/bn_mp_mul_2.c,v $ */
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81 /* $Revision: 1.3 $ */
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82 /* $Date: 2006/03/31 14:18:44 $ */